Switch



Nov. 3, 1931. F, 1 msm-1ER 1,829,893

SWITCH Filed Nov. 8, 1929 V 57 A 54 /I f77 renor:

Patented Nov. 3, 1931 UNITED VSTATES PATENT OFFICE FBANZ' JSEPH FISCHER,0F DBESI'DEN, GERMANY, ASSIGNOB TO THE FEM KOCH &

STEBZEL AKTIENGESELLSCHAFT, F DRESDEN, GEBIANY SWITCH Application tiledNovember 8, 1929,'Seria1 No. 405,687, and in Germany vNovember 7, 1928.

My invention relates to switching devices and particularly to high voltae disconnecting switches. It is an object o my invention to rovideanimproved combination of the swltchingmembers and insulators withelectrical devices such as for instance measuring ilnsformers, groundinginductances and the e. According to my invention the switching AAmfdevices are provided with hollow insulators and the electricaldevices are arranged in the interiorsof the insulators of thedlsconnecting switch. In consequence thereof the construction of theswitching plant is simplified and a saving of material is obtained,since the insulators of the switch are arranged to form the insulatingc-asings for themeasuring transformers and the like. Furthermore anyfault in the measuri transformers will be remarked by the atten ant muchsooner than it would when the transformers were arranged in the commonlyused manner at an inaccessible place of the plant.

Itis a further object of my invention to provide a multiple-pieceinsulator, and a set of measuring transformers, grounding in-' ductancesor the like, the single transformers being arranged in the single pieces,ofwhich v the insulator is composed. When a current transformer isarranged in the insulator, the terminals of the primary winding of thetransformer may be arranged in such manner that the primary winding isinserted in the line when the disconnecting switch is switched in.. Ifyvoltage transformers or grounding inductances are arranged in hightension insulators, the terminals are'connect' ed in such manner thatthey connect the switching contact carried by the insulator to Y und. Itis still another object of my invention It is still another advantage ofmy inven tion that the insulating caslngs are heated by the heatproduced in the windings and the iron of the devices arranged within theinsulators. In consequence thereof the switches will not be covered withice as they would in outdoor stations at 10W temperatures.

In the accompanying drawing a preferred embodiment of my invention isillustrated diagrammatically by way of example in vertical section.

Referring to the drawing, 13, 14, 15 are three high voltage insulators,the middle of one of which is rotatably supported on a ball bearing 12.13 and 14 are contact members carried by the insulators 13 and 14,respectively, contact member 13 being connected to the sup lyv line,contact member 14 to the load circult. 11 is the movable switch armcarried by the insulator 15 and terminating in the movable contactmembers 16 and 18. The arm 11 may consist of insulating material or ofconductive material. In the latter case the top piece 15 of theinsulator 15 is made of insulatin material. The conica-l shaft portionsof ghe insulators 13, 14, 15 comprise several hollow parts 13a, 13betc., 14a, 14?; etc., and 15a, 15b etc., respectively, the joints ofwhich are shielded by means of metal rings 22 arranged on the outer sideof the insulators. 19, 2O and 21 are current' transformers arrangedwithin the middle insulator 15. The primary winding of the transformer19 is connected to the movable switch contact members 16 and 18 by meansof wires 16 and 18 traversing the arm 11. 17 is avresistor of highresistance connected in shunt to the primary winding of the transformer19 and preventing the transmitting of overvoltages to the currenttransformer 19. The primary winding of the current transformer 2O isconnected to the secondary winding of the current transformer 19, andthe primary winding of the current transformer 21 is connected to thesecondary winding of the current transformer 20, while the secondarywinding of the current transformer 21 is connected to an ammeter 34 bymeans of flexible connections 23. A voltage transformer consisting ofsingle transformers 24 to 27 is arranged in the left-hand insulator 13,the secondary winding of transformer 27 being connected to a voltmeter37. The primary winding of transformer 24 is connected 5 at one end tothe Contact member 13 and at the other end to the transformer core andthe secondary winding of transformer A rounding inductance is arrangedin the rig t-hand 1nsulator-14, it comprises four arts 28 to 31connected in series. The inuctance 28 is connected to the contact member14', the inductance 31 is connected to ground, so that a connection fromthe contact y. member 14 to ground through the ground- 15 ing inductanceis established.

Plates 35 and 36 are provided in the insulators 13 and 14, respectively,carrying the voltage transformers 24 to 27 and the inductances 28 to 31,respectively. The plates 35 are provided with wall ltube insulators 35for the connections between the single voltage transformers arranged inthe insulator 13. In the insulator 14 the plates 36 are. electricallyconnected t'o the windings lof the inductances 28 etc. In theintermediate insulator 15 brackets 32 are' provided carrying the currenttransformers 19 to 21.

33 is an actuating lever adapted to rotate the intermediate insulatorY15.

The operation of this switching device is as follows: n

' When the device is in its closed position as shown in the drawing, thecurrent flows from the supply circuit through stationary -35 contactmember 13', movable contact member 16, conductor '16', primary windingof current transformer 19, conductor 18', movoable contact member 18 andstationary contact member 14 to the load circuit. The 40 voltage ismeasured by means of the voltage transformer and the voltmeter 37 Thecurrent is measured by means of the current transformers 19 to 21 andammeter 34. When the middle insulator 15 is rotated by means of theactuating lever 33 and the disconnecting switch is' moved into its openposition, the current transformers 19 to 21 are wholly switched oif andmay beA revised or replaced, while the supply voltage is still measuredby the voltage transformers 24 to 27 and the voltmeter 37.

My invention is not limited to insulators of the bracket type as showninthe drawing, it may also used in Wall tube or suspended insulators.

I wish it to be understood that I do not desire to be limited .to theexact details of construction shown and described for obviousmodifications will occur to a person skilled in the-art.

v I claim:

1. In a high voltage disconnecting switch, a hollow supportinginsulator, an electrical device comprlsing an iron core and a winding 55cooperating with said core mounted within said insulator, a switchelement mounted at one end of said insulator and a high voltageconnection leading from said switch element to said electrical device.

2. rIhe device of claim 1 in which the said electricaldevice is acurrent transformer.

3. The device of claim 1 in which the said electrical device is avoltage transformer. n

4. The device of claim 1 in which the said electrical device is agrounding inductance.

5. In a high voltage disconnectin switch, a hollow supporting insulator,a vo tage reducing mechanism mounted 'within said insulator, a switchelement mounted at one end of said insulator, a high voltage connectionpassing through said end .of said insulator and leading from said switchelement to said voltage reducing mechanism, and a low voltage connectionpassing through the other end of said insulator.

6. The device of claim 5 in which the voltage reducing mechanism is aninstrument transformer.

7. In a high voltage disconnecting switch,

a hollow supporting insulator, a switch element constituting the lineside of said dis' connecting switch mounted on one end of saidinsulator, a voltage transformer mounted within said insulator and ahigh voltage connection leadin from said switch element to the primary osaid voltage transformer. 8. In a high voltage disconnectin switch, arotatable hollow insulator, switc blades mounted on one end of saidrotatable insulator, an instrument transformer mounted within saidinsulator and high voltage connections leading from the said switchblades to the primary of said instrument transe' former. Y

In testimony whereof I ailix m si nature.

FRANZ JOSEPH F SC R.

